using System;
using System.Linq;
using System.Web.Mvc;
using System.Web.Routing;

namespace Umbraco.Web.Mvc
{
	internal static class RouteValueDictionaryExtensions
	{

		/// <summary>
		/// Converts a route value dictionary to a form collection
		/// </summary>
		/// <param name="items"></param>
		/// <returns></returns>
		public static FormCollection ToFormCollection(this RouteValueDictionary items)
		{
			var formCollection = new FormCollection();
			foreach (var i in items)
			{
				formCollection.Add(i.Key, i.Value != null ? i.Value.ToString() : null);
			}
			return formCollection;
		}

		/// <summary>
		/// Returns the value of a mandatory item in the route items
		/// </summary>
		/// <param name="items"></param>
		/// <param name="key"> </param>
		/// <returns></returns>
		public static object GetRequiredObject(this RouteValueDictionary items, string key)
		{
			if (key == null) throw new ArgumentNullException("key");
			if (!items.Keys.Contains(key))
				throw new ArgumentNullException("The " + key + " parameter was not found but is required");
			return items[key];
		}

	}
}